[ARC5] AN/ARC-5 R-23 Question

[Mark K3MSB]

Hi Mike

Thank you for taking the time to post that!   Much appreciated.

You noted that the C-24/ARC-5 had no audio jack;  the audio jack in my HB
version is connected to J1-4 for the instrument landing system.

73 Mark K3MSB

On Wed, Dec 27, 2023 at 7:37 AM Mike Morrow <kk5f at earthlink.net> wrote:

> The CW-4/ARC-5 and CW-5/ARC-5 are nothing more than black plastic screw-on
> covers for two different diameters of A.R.C. connectors found in the
> AN/ARC-5 system to cover unused connectors.  They are mentioned in several
> places in the LF/MF/HF AN/ARC-5 Maintenance Handbook.
>
> THE ONLY ADAPTER PANEL THAT HAD A CONNECTOR WITH CW-4/ARC-5 COVER ON ITS
> FRONT IS THE MX-19/ARC-5 ILS Adapter...see below.
>
> HOWEVER  the R-23* and R-24/ARC-5 came from factory with CW-4 on the
> spline connector for its LOOP selector switch.
>
> There are four very different AN/ARC-5 receiver adapter panels:
>
> MX-19/ARC-5 Audio Adapter:  This adapter has ONLY ONE function to connect
> ONLY the R-23* or R-24/ARC-5 to the AN/ARN-9 USN Air-Track ILS. (The
> AN/ARN-9 is the ILS that is mentioned in several places in the LF/MF/HF
> AN/ARC-5 Maintenance Handbook.  It was abandoned in 1944 in favor of the
> USAAF SCS-51 ILS. )  The MX-19 is not rare, but it has no other use than
> with AN/ARN-9.  There is no SCR-274-N equivalent.
>
> MX-20/ARC-5 Power Adapter:  This supplies 24 and 250 vdc to accessory
> systems like AN/ARR-1, O-4/ARC-5, LM-* and works with any AN/ARC-5 receiver
> except R-28.  It is equivalent to FT-310-A in SCR-274-N.  It was factory
> supplied with R-24/ARC-5 to supply power to the associated AN/ARR-1
> ZB-homing adapter.  Both the R-24/ARC-5 and AN/ARR-1 were abandoned by USN,
> replaced by R-4*/ARR-2 ZB-homing receiver.
>
> MX-21/ARC-5 Remote Control Adapter:  Blank panel that routes 24 vdc for
> remote control when local control adapter panel is not installed.   It is
> equivalent to FT-230-A in SCR-274-N.  It was factory supplied with all
> AN/ARC-5 receivers except R-24/ARC-5 and R-28/ARC-5.
>
> C-24/ARC-5 Local Control Adapter:  Provides local power/emission switch
> and RF Gain control.  There are NO audio jacks.  It is equivalent to
> FT-260-A in SCR-274-N.
>
> SUMMARY:  The R-23*/ARC-5 receiver was factory supplied with the
> MX-21/ARC-5 remote control adapter, but it may be found with the
> MX-20/ARC-5 power adapter instead.  Plastic cover CW-4/ARC-5 for the loop
> antenna switch spline was supplied from the factory with R-23* and
> R-24/ARC-5.
>
> Mike / KK5F
>
> -----Original Message-----
> From: Mark K3MSB <mark.k3msb at gmail.com></mark.k3msb at gmail.com>
> Sent: Dec 26, 2023 6:42
>
>
> I've a question on the HB local remote switch. I believe the real cover
> has a jack with the cover labeled CW-4 ?? This is what I've seen on web
> pictures of other R-23 receivers, yet Figure 6-2 of the previously
> mentioned AN/ARC-5 manual seems to show a different connector MX-20/ARC-5
> power adapter ?
>
> 73 Mark
>
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